Which of the Following Statements Is True of the Theory

Which of the following statements is true of the theory of national competitive advantage of industries?

A) It focuses on why certain industries within a nation are competitive internationally.
B) It proposes to help only a few strategically important industries.
C) It was first proposed in the 1960s by the American economist Raymond Vernon.
D) It is the idea that governments should actively protect domestic industries from imports and vigorously promote exports.